6o 
BULLETIN OF THE LABORATORIES 
CYTHERE OHIOENSIS, sp. n. 
(Plate VIII, Fig. 8, Vol. III. Plate III, Fig. 19.) 
Carapace narrowly ovate, smooth; profile rhomboidal, acute at 
either end; valves marked by a rather acute prominence near the 
middle of the length and one-third from the dorsal margin, surface 
very strongly arched toward the dorsal margin, more gently inclined 
to the ventral margin. 
Length, 7 mm., width, 35 mm. Common in the upper part of 
division III, at Newark, Rushville and Ashland Co. 
The generic reference is purely provisional, the species resembles 
a Leperditia in some respects, though seeming like an enlarged 
Cytherella. It may be compared with a form figured by Meek from 
Nebraska. 
Before taking up the general discussion of the list here presented 
we should study the Coelenterata, Echinodermata, Bryozoa, and 
Pisces, of all which groups more or fewer specimens have been secured. 
Unfortunately the material collected in all but one is very meager, 
while the crinoids have already been quite fully discussed by Prof. 
Hall. The Bryozoa are abundant upon several horizons. We have 
been so fortunate as to secure the assistance in this difficult group of 
the highest ^authority upon the subject of sub-carboniferous Bryozoa, 
Mr. E. O. Ulrich, whose work in connection with the Geological 
surveys of Minnesota and Illinois places him in a position to speak 
authoritatively upon this group. This is of special moment in the 
present instance in as much as the localities furnishing Bryozoa (ex- 
cepting a single horizon) are well up in the series and have been re- 
ferred on other grounds by us to just those epochs chiefly represented 
in Illinois, 
Of the kindness of Mr. Ulrich in preparing and donating the fol- 
lowing paper we desire to make special acknowledgment. 
